Grilled Caramelized Onion Burgers

• 1 tablespoon Land O Lakes Butter
• 2 large (4 cups) yellow onions, sliced
• 1 teaspoon finely chopped fresh thyme leaves*
• 1 teaspoon white wine vinegar
• 1/4 teaspoon coarse ground pepper
• 1/8 teaspoon salt
• 1 1/2 pounds lean ground beef
• 2 tablespoons stone-ground mustard
• 1/4 teaspoon salt
• 2 teaspoons coarse ground pepper
• 4 onion hamburger buns

1. Melt butter in 12-inch skillet until sizzling; add onions.
2. Cook over medium heat, stirring occasionally, 35-40 minutesuntil onions are tender and deep golden brown.
3. Stir in thyme, vinegar, 1/4 teaspoon pepper and 1/8 teaspoon salt.
4. Continue cooking, stirring occasionally, 5 minutes or until onions are caramelized.
5. Heat gas grill on medium or charcoal grill until coals are ash white.
6. Combine ground beef, mustard and salt in bowl; mix lightly.
7. Shape into 4 (3/4-inch thick) patties.
8. Sprinkle both sides of patties with pepper.
9. Place patties onto grill.
10. Grill, turning once, 10-12 minutes or until internal temperature reaches at least 160F or until desired doneness.
11. Grill hamburger buns until toasted.
12. Fill buns with hamburgers; top each with 1/4 cup onion mixture.
13. *Substitute 1/4 teaspoon dried thyme leaves.
14. Broiling Directions: Prepare onions and patties as directed above.
15. Heat broiler.
16. Place patties onto broiler pan.
17. Broil, turning once, 12-15 minutes or until internal temperature reaches at least 160F or until desired doneness.

butter, yellow onions, thyme, white wine vinegar, coarse ground pepper, salt, lean ground beef, stoneground mustard, salt, ground pepper, onion

Taken from www.landolakes.com/recipe/1213/grilled-caramelized-onion-burgers (may not work)